Re: CD/DVD building on farbror

[Richard Atterer <richard@2006.atterer.net>]

On Sat, Nov 25, 2006 at 01:14:46PM +0000, Steve McIntyre wrote:
> On farbror, we're incurring the extra disk bandwidth hit of building ISO 
> files alongside the jigdo files.

FWIW, it might be beneficial not to have the OS cache the .iso data after 
it has been written to disc. That way, when jigdo-file or JTE write the 
.iso file, the file data does not push other data (e.g. from input .deb 
files) out of the cache.

Basically, one would have to use something like 
posix_fadvise(fd,0,0,POSIX_FADV_NOREUSE).

ISTR hearing once that this only really works for read accesses under 
Linux, and that one would have to read back written data immediately to 
trigger the right behaviour. I can't find any references to this right now, 
so just treat it as urban myth. :)

Cheers,

  Richard

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